void main(List<String> args) {
  bool show = false;
  if (show) {
    print('111');
  } else {
    print('222');
  }

  bool isMarry = false;
  isMarry ? '已婚' : '未婚';
  print(isMarry ? '已婚' : '未婚');

  int count = 0;
  bool isOK = count == 0;
}
